Do not override Immutables version
Do not override Immutables version

Immutables is define din odlparent, no need to specify
the version again.

Change-Id: I03aed6f7f52f34c0302ee930a6b2b8a723512156
Signed-off-by: Robert Varga <b8bd3df785fdc0ff42dd1710c5d91998513c57ef@cisco.com>

opendaylight/yangtools,opendaylight/yangtools